hidden form elements are simply not shown to the user although he can open the source and find them. You can use them like nomal <input>-field except that their type=hidden.
The normal and less dangerous way is to save the data you've got (maybe into a database (mark the entry it temporary) or a temporary file) and reread the data in the second script.

--
package Lizard::King;
sub can { do { 'anything'} };
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TomK32 - just a geek trying to change the world